First, I know this is probably a case of my imagination seeing things that aren't there. Second, I don't believe this is how Gwen actually feels, but how the character in the song feels. Now that that's out of the way, I think another possibility of this song is that the narrator is realizing subconsciously that she has lesbian (or bisexual) tendancies, and this "cute girl" is really stirring up those feelings. Since she still hasn't come to terms with this, she interprets her feelings of the stereotypical bitchy jealousy discussed in the other interps. I'm not saying that's definitely what's happening, but it's possible (and I'm sure it's happened in real life more than a few times).
First, I know this is probably a case of my imagination seeing things that aren't there. Second, I don't believe this is how Gwen actually feels, but how the character in the song feels. Now that that's out of the way, I think another possibility of this song is that the narrator is realizing subconsciously that she has lesbian (or bisexual) tendancies, and this "cute girl" is really stirring up those feelings. Since she still hasn't come to terms with this, she interprets her feelings of the stereotypical bitchy jealousy discussed in the other interps. I'm not saying that's definitely what's happening, but it's possible (and I'm sure it's happened in real life more than a few times).